Other
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsh22a..05g&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #SH22A-05
Other
7519 Flares, 7534 Radio Emissions, 7847 Radiation Processes
Scientific paper
Type III radio bursts are produced by the energetic electrons accelerated by solar flares. The partial conversion of Langmuir waves excited by these electrons into escaping radiation at the fundamental and second harmonic of the electron plasma frequency, fpe is believed to be the emission mechanism for these bursts. The directivity patterns of the electromagnetic waves are the functions of the direction of observation. For example, the fundamental emission is highly directive and beamed with half angle sin-1μ around the ambient magnetic field, where μ is the refractive index. On the other hand, we show that the directivity pattern of second harmonic emission consists of four symmetric lobes, separated from each other by 60 degrees both in the presence as well as in the absence of ambient magnetic field. We present the simultaneous observations of type III radio bursts from the Ulysses and Wind spacecraft situated at two different, widely separated locations to investigate the angular dependence of the intensity and of the time profiles of type III radio bursts. Most of the bursts are observed by both the spacecraft, even when one spacecraft was on the opposite side of the Sun from the other. We show that the ratio of intensities measured at the peak of the events (directivity factor), and the time profiles in both directions of observation are consistent with the computed primary directivity pattern of the radiating sources.
Golla T.
Macdowall Robert J.
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